Electric-motor-assisted bicycle

An electric-motor-assisted bicycle comprising:

• a front wheel;
• a rear wheel located rearward of the front wheel;
• a vehicle-body frame that supports the front wheel and the rear wheel;
• and
• a drive unit attached to the vehicle-body frame to generate driving power to be transmitted to the rear wheel;
• wherein
• the drive unit includes:
• a housing;
• and
• a crank axle extending through the housing in a left-right direction with respect to the bicycle;
• the vehicle-body frame includes a bracket;
• the drive unit is attached to the bracket;
• the bracket includes:
• a top plate;
• a first side plate connected to the top plate;
• and
• a second side plate connected to the top plate, the second side plate being spaced apart from the first side plate along the left-right direction of the bicycle;
• the housing includes a first suspension boss and a second suspension boss located between the first side plate and the second side plate along the left-right direction of the bicycle;
• a first bolt is fastened to the first suspension boss and extends through a hole in the first side plate along the left-right direction of the bicycle;
• an insertion hole is provided in the second suspension boss, the insertion hole extending in the left-right direction of the bicycle and being open toward the second side plate;
• the electric-motor-assisted bicycle further comprises a cylindrical member fitted into the insertion hole and slidable in a direction in which the insertion hole extends;
• a thread groove is provided on an inner periphery of the cylindrical member, the thread groove engaging a thread on an outer periphery of a second bolt that extends through a hole provided in the second side plate along the left-right direction of the bicycle;
• the first bolt is fastened to the first suspension boss such that tightening of the first bolt causes the housing to move toward the first side plate along the left-right direction with respect to the bicycle such that the housing is pushed against the first side plate;
• and
• the thread on the outer periphery of the second bolt engages the thread groove provided on the inner periphery of the cylindrical member such that tightening of the second bolt causes the cylindrical member to move in a direction from out of the insertion hole such that the cylindrical member is pushed against the second side plate.